Fix for non-searchable no filter columns

Author: mcintyre321

Mvc.JQuery.Datatables.Core/ColumnFilterSettingsVm.cs

@@ -20,11 +20,11 @@ public ColumnFilterSettingsVm(DataTableConfigVm vm)
 
         public override string ToString()
         {
-            var noColumnFilter = new FilterDef(null);
+            var noColumnFilter = null as FilterDef;
             this["bUseColVis"] = _vm.ColVis;
             this["aoColumns"] = _vm.Columns
                 //.Where(c => c.Visible || c.Filter["sSelector"] != null)
-                .Select(c => c.Searchable?c.Filter:noColumnFilter).ToArray();
+                .Select(c => c.Searchable && c.Filter != null ? c.Filter : noColumnFilter).ToArray();
             return new JavaScriptSerializer().Serialize(this);
         }
     }

Mvc.JQuery.Datatables.Core/FilterDef.cs

@@ -23,7 +23,7 @@ private void SetDefaultValuesAccordingToColumnType(Type t)
         {
             if (t==null)
             {
-                type = "null";
+                this.Remove("type");
             }
             else if (DateTypes.Contains(t))
             {

Mvc.JQuery.Datatables.Example/Controllers/HomeController.cs

@@ -89,6 +89,7 @@ public class UserView
         [DataTablesExclude]
         public string ThisColumnIsExcluded { get { return "asdf"; } }
 
+        [DataTables(Sortable = false, Searchable = false)]
         [DataTablesFilter(DataTablesFilterType.None)]
         public string Thumb { get; set; }
     }